Improvement in ships  trestle-trees



timidi HENRY TOWNSEND, OF PHILADELPHIA, PENNSYLVANIA.

Letters Patent No. 113,471, dated April 4, 1871 entedated March 22,1871.

IMPROVEMENT IN SHIPS TRESTLE-TREES.V

The Schedule referred to in these Letters Pat-ent and making part of thesame.

' To all whom it 'may concern:

Be it known that I, HENRY TowNsEND, ofthe city and countyof'Bhiladelphia and State of Pennsylvania, have invented Improvements inTrestle-Trees .and Ship-Rigging; and tlp hereby declare the following ito be a full and correct description ofthe same, reference being had tothe acceropanying drawings, in which;-

Fgure l represents the mast-headwith the trestl'e` tree and cross-treeso constructed as to give room for the ropes called peak-halliards, andalso showing Yfriction-rollers to prevent the ropes chafing on thetrstletrees.

Figure 2 shows the under side of. a trestle-tree made to t a squareshoulder of the mast-head.

Figure 3'shows the square shoulder of the masthead.

lhe nature of my invention consists of making a cross-tree of such acrooked shape that the ropes have free play without chafing when the`sails are hoisted or lowered; and to give strength to this cross-tree Imake the under side of iron and the vtop of wood, the wood being moresafe to stand upon; or, iffmade wholly of iron, the top side isroughened, so that a man may stand upon it Without slipping.

I also attach friction-rollers to the cross-trees or trestle-trees toprevent the rope from rubbing on the trestle-tree. Y

.To enable others to understand my invention I refer to the drawings, inwhich Letter A marks the cross-tree.

'Letters B B, the friction-rollers.`

Letter D marks an elastic packing inQcomhination with the metallictrestle-tree and wire-shrouds.

The object of making a metallic trestle-tree with a square shoulder isto adapt it to the standing mastnow in use without lowering or cuttingaway the shoulder of the same. By this means a metallic trestle-tree isa baud of strength to an old mast.

It is well known to seamen, the great wear and tear of' ropes by ehafingupon the cross-tree as the sails are hoisted and lowered. Therefore, `across-tree of this peculiar shape is very essential to allow the ropesfree play; and it will be seen by the drawings herewith r thatk thisplate of-metal, in combination with the wood,

gives-great strength to a cross-tree of this shape, as herein described.y

Gleim.

The above specification of my said invention signed and witnessed atPhiladelphia this 16th day of December, A. D. 1869.

HENRY TOWNSEND,

Witnesses:

OWEN MeDoNALD, JOSEPH BAYMORE.

